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VulnerabilityPublished

CVE-2026-128134: nltk · Untrusted Search Path

Affects nltkSource CVE Database V5

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Mentioned vulnerabilities

Not known to be exploited · CVSS 7.8 High : upgrade to 3.10.4 soon.

Data as of 13 Nov 2026, 22:48 UTC

CVSS 3.1 base score
7.8High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 3.17.8
Patch
Available – fixed in 3.10.4
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade nltk to 3.10.4.

Affected software

ProductAffectedFixed in
nltknltkAffected
  • <3.10.4
Fixed in
  • 3.10.4

AI-suggested

Upgrade NLTK to version 3.10.4 or later, where this vulnerability is fixed. No other mitigations are indicated by the vendor advisory. Users should ensure that directories in their PATH are not writable by untrusted users to reduce risk.

Description

NLTK versions prior to 3.10.4 contain an untrusted search path vulnerability in the nltk.parse.dependencygraph.dot2img function. This function resolves the Graphviz dot executable via the PATH environment variable but does not perform ownership or writability validation on the resolved executable. A local low-privileged attacker with write access to a directory in the victim's PATH can replace or plant a malicious dot executable, leading to code execution when dot2img or DependencyGraph.repr_svg is invoked. This issue is fixed in version 3.10.4.

References

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